Bush, Argos, B&Q or us at fault

We recently purchased a new kitchen from B & Q. We purchased an integrated Bush Dishwasher to be fitted within. We followed the fitting instructions from the dishwasher using the fixing kit supplied with it ( containing 2 large headed screws and 2 velcro fixing pads) to fit the B & Q cupboard door. The dishwasher has only been used twice and a few hours after using the appliance, we heard a loud bang in the kitchen. We went into the kitchen to find the cabinet door had fallen off, resulting in the corner of the cabinet door hitting the floor and damaging the corner of the cabinet door. I spoke to someone from Bush, who said I needed to contact Argos, which I did. Argos said "as we don't provide the fitting service or the door, we are not liable for any damaged caused to your pre-existing belongings."
I explained that the fixing kit supplied with the Bush appliance, purchased from Argos, was obviously inadequate for the purpose, to which their reply was "if you feel that way, I advise you to seek independent advice." Is there anything I can do? It looks like we will need to purchase another cabinet door from B & Q and a different, more adequate fixing kit, at extra cost to ourselves.

Thanks in advance